Table 2.

Endoscopic appearance [2, 5, 6].

Localization	Distal or mid-esophagus	>50%
	Entire esophagus	26%
Early stage	Exudate	90%
	Friable mucosa	84%
	Vesicles	80%
	Circumscribed ulcers	40%
	Cobblestoning (lesions confluence)	30%
Late stage	Necrosis	40%